From: Tilman Schmidt Date: Mon, 5 Jul 2010 14:18:43 +0000 (+0000) Subject: isdn/gigaset: avoid copying AT commands twice X-Git-Tag: v2.6.36-rc1~571^2~327 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e3628dd176ba3ed329991ef042c29aae60617630;p=platform%2Fkernel%2Flinux-exynos.git isdn/gigaset: avoid copying AT commands twice Change the Gigaset driver's internal write_cmd interface to accept a cmdbuf structure instead of a string. This avoids copying formatted AT commands a second time. Impact: optimization Signed-off-by: Tilman Schmidt Signed-off-by: David S. Miller --- diff --git a/drivers/isdn/gigaset/bas-gigaset.c b/drivers/isdn/gigaset/bas-gigaset.c index 47a5ffe..2dab531 100644 --- a/drivers/isdn/gigaset/bas-gigaset.c +++ b/drivers/isdn/gigaset/bas-gigaset.c @@ -1913,65 +1913,41 @@ static int start_cbsend(struct cardstate *cs) * USB transmission is started if necessary. * parameters: * cs controller state structure - * buf command string to send - * len number of bytes to send (max. IF_WRITEBUF) - * wake_tasklet tasklet to run when transmission is completed - * (NULL if none) + * cb command buffer structure * return value: * number of bytes queued on success * error code < 0 on error */ -static int gigaset_write_cmd(struct cardstate *cs, - const unsigned char *buf, int len, - struct tasklet_struct *wake_tasklet) +static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb) { - struct cmdbuf_t *cb; unsigned long flags; int rc; gigaset_dbg_buffer(cs->mstate != MS_LOCKED ? DEBUG_TRANSCMD : DEBUG_LOCKCMD, - "CMD Transmit", len, buf); - - if (len <= 0) { - /* nothing to do */ - rc = 0; - goto notqueued; - } + "CMD Transmit", cb->len, cb->buf); /* translate "+++" escape sequence sent as a single separate command * into "close AT channel" command for error recovery * The next command will reopen the AT channel automatically. */ - if (len == 3 && !memcmp(buf, "+++", 3)) { + if (cb->len == 3 && !memcmp(cb->buf, "+++", 3)) { + kfree(cb); rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT); - goto notqueued; - } - - if (len > IF_WRITEBUF) - len = IF_WRITEBUF; - cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC); - if (!cb) { - dev_err(cs->dev, "%s: out of memory\n", __func__); - rc = -ENOMEM; - goto notqueued; + if (cb->wake_tasklet) + tasklet_schedule(cb->wake_tasklet); + return rc < 0 ? rc : cb->len; } - memcpy(cb->buf, buf, len); - cb->len = len; - cb->offset = 0; - cb->next = NULL; - cb->wake_tasklet = wake_tasklet; - spin_lock_irqsave(&cs->cmdlock, flags); cb->prev = cs->lastcmdbuf; if (cs->lastcmdbuf) cs->lastcmdbuf->next = cb; else { cs->cmdbuf = cb; - cs->curlen = len; + cs->curlen = cb->len; } - cs->cmdbytes += len; + cs->cmdbytes += cb->len; cs->lastcmdbuf = cb; spin_unlock_irqrestore(&cs->cmdlock, flags); @@ -1988,12 +1964,7 @@ static int gigaset_write_cmd(struct cardstate *cs, } rc = start_cbsend(cs); spin_unlock_irqrestore(&cs->lock, flags); - return rc < 0 ? rc : len; - -notqueued: /* request handled without queuing */ - if (wake_tasklet) - tasklet_schedule(wake_tasklet); - return rc; + return rc < 0 ? rc : cb->len; } /* gigaset_write_room diff --git a/drivers/isdn/gigaset/ev-layer.c b/drivers/isdn/gigaset/ev-layer.c index ceaef9a..0d5984a 100644 --- a/drivers/isdn/gigaset/ev-layer.c +++ b/drivers/isdn/gigaset/ev-layer.c @@ -797,48 +797,27 @@ static void schedule_init(struct cardstate *cs, int state) static void send_command(struct cardstate *cs, const char *cmd, int cid, int dle, gfp_t kmallocflags) { - size_t cmdlen, buflen; - char *cmdpos, *cmdbuf, *cmdtail; + struct cmdbuf_t *cb; + size_t buflen; - cmdlen = strlen(cmd); - buflen = 11 + cmdlen; - if (unlikely(buflen <= cmdlen)) { - dev_err(cs->dev, "integer overflow in buflen\n"); + buflen = strlen(cmd) + 12; /* DLE ( A T 1 2 3 4 5 DLE ) \0 */ + cb = kmalloc(sizeof(struct cmdbuf_t) + buflen, kmallocflags); + if (!cb) { + dev_err(cs->dev, "%s: out of memory\n", __func__); return; } - - cmdbuf = kmalloc(buflen, kmallocflags); - if (unlikely(!cmdbuf)) { - dev_err(cs->dev, "out of memory\n"); - return; - } - - cmdpos = cmdbuf + 9; - cmdtail = cmdpos + cmdlen; - memcpy(cmdpos, cmd, cmdlen); - - if (cid > 0 && cid <= 65535) { - do { - *--cmdpos = '0' + cid % 10; - cid /= 10; - ++cmdlen; - } while (cid); - } - - cmdlen += 2; - *--cmdpos = 'T'; - *--cmdpos = 'A'; - - if (dle) { - cmdlen += 4; - *--cmdpos = '('; - *--cmdpos = 0x10; - *cmdtail++ = 0x10; - *cmdtail++ = ')'; - } - - cs->ops->write_cmd(cs, cmdpos, cmdlen, NULL); - kfree(cmdbuf); + if (cid > 0 && cid <= 65535) + cb->len = snprintf(cb->buf, buflen, + dle ? "\020(AT%d%s\020)" : "AT%d%s", + cid, cmd); + else + cb->len = snprintf(cb->buf, buflen, + dle ? "\020(AT%s\020)" : "AT%s", + cmd); + cb->offset = 0; + cb->next = NULL; + cb->wake_tasklet = NULL; + cs->ops->write_cmd(cs, cb); } static struct at_state_t *at_state_from_cid(struct cardstate *cs, int cid) @@ -1240,8 +1219,22 @@ static void do_action(int action, struct cardstate *cs, break; case ACT_HUPMODEM: /* send "+++" (hangup in unimodem mode) */ - if (cs->connected) - cs->ops->write_cmd(cs, "+++", 3, NULL); + if (cs->connected) { + struct cmdbuf_t *cb; + + cb = kmalloc(sizeof(struct cmdbuf_t) + 3, GFP_ATOMIC); + if (!cb) { + dev_err(cs->dev, "%s: out of memory\n", + __func__); + return; + } + memcpy(cb->buf, "+++", 3); + cb->len = 3; + cb->offset = 0; + cb->next = NULL; + cb->wake_tasklet = NULL; + cs->ops->write_cmd(cs, cb); + } break; case ACT_RING: /* get fresh AT state structure for new CID */ diff --git a/drivers/isdn/gigaset/gigaset.h b/drivers/isdn/gigaset/gigaset.h index 8738b08..904c947 100644 --- a/drivers/isdn/gigaset/gigaset.h +++ b/drivers/isdn/gigaset/gigaset.h @@ -574,9 +574,7 @@ struct bas_bc_state { struct gigaset_ops { /* Called from ev-layer.c/interface.c for sending AT commands to the device */ - int (*write_cmd)(struct cardstate *cs, - const unsigned char *buf, int len, - struct tasklet_struct *wake_tasklet); + int (*write_cmd)(struct cardstate *cs, struct cmdbuf_t *cb); /* Called from interface.c for additional device control */ int (*write_room)(struct cardstate *cs); diff --git a/drivers/isdn/gigaset/interface.c b/drivers/isdn/gigaset/interface.c index c9f28dd..f45d686 100644 --- a/drivers/isdn/gigaset/interface.c +++ b/drivers/isdn/gigaset/interface.c @@ -339,7 +339,8 @@ static int if_tiocmset(struct tty_struct *tty, struct file *file, static int if_write(struct tty_struct *tty, const unsigned char *buf, int count) { struct cardstate *cs; - int retval = -ENODEV; + struct cmdbuf_t *cb; + int retval; cs = (struct cardstate *) tty->driver_data; if (!cs) { @@ -355,18 +356,39 @@ static int if_write(struct tty_struct *tty, const unsigned char *buf, int count) if (!cs->connected) { gig_dbg(DEBUG_IF, "not connected"); retval = -ENODEV; - } else if (!cs->open_count) + goto done; + } + if (!cs->open_count) { dev_warn(cs->dev, "%s: device not opened\n", __func__); - else if (cs->mstate != MS_LOCKED) { + retval = -ENODEV; + goto done; + } + if (cs->mstate != MS_LOCKED) { dev_warn(cs->dev, "can't write to unlocked device\n"); retval = -EBUSY; - } else { - retval = cs->ops->write_cmd(cs, buf, count, - &cs->if_wake_tasklet); + goto done; + } + if (count <= 0) { + /* nothing to do */ + retval = 0; + goto done; } - mutex_unlock(&cs->mutex); + cb = kmalloc(sizeof(struct cmdbuf_t) + count, GFP_KERNEL); + if (!cb) { + dev_err(cs->dev, "%s: out of memory\n", __func__); + retval = -ENOMEM; + goto done; + } + memcpy(cb->buf, buf, count); + cb->len = count; + cb->offset = 0; + cb->next = NULL; + cb->wake_tasklet = &cs->if_wake_tasklet; + retval = cs->ops->write_cmd(cs, cb); +done: + mutex_unlock(&cs->mutex); return retval; } diff --git a/drivers/isdn/gigaset/ser-gigaset.c b/drivers/isdn/gigaset/ser-gigaset.c index e96c058..d151dcb 100644 --- a/drivers/isdn/gigaset/ser-gigaset.c +++ b/drivers/isdn/gigaset/ser-gigaset.c @@ -241,30 +241,13 @@ static void flush_send_queue(struct cardstate *cs) * return value: * number of bytes queued, or error code < 0 */ -static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf, - int len, struct tasklet_struct *wake_tasklet) +static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb) { - struct cmdbuf_t *cb; unsigned long flags; gigaset_dbg_buffer(cs->mstate != MS_LOCKED ? DEBUG_TRANSCMD : DEBUG_LOCKCMD, - "CMD Transmit", len, buf); - - if (len <= 0) - return 0; - - cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC); - if (!cb) { - dev_err(cs->dev, "%s: out of memory!\n", __func__); - return -ENOMEM; - } - - memcpy(cb->buf, buf, len); - cb->len = len; - cb->offset = 0; - cb->next = NULL; - cb->wake_tasklet = wake_tasklet; + "CMD Transmit", cb->len, cb->buf); spin_lock_irqsave(&cs->cmdlock, flags); cb->prev = cs->lastcmdbuf; @@ -272,9 +255,9 @@ static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf, cs->lastcmdbuf->next = cb; else { cs->cmdbuf = cb; - cs->curlen = len; + cs->curlen = cb->len; } - cs->cmdbytes += len; + cs->cmdbytes += cb->len; cs->lastcmdbuf = cb; spin_unlock_irqrestore(&cs->cmdlock, flags); @@ -282,7 +265,7 @@ static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf, if (cs->connected) tasklet_schedule(&cs->write_tasklet); spin_unlock_irqrestore(&cs->lock, flags); - return len; + return cb->len; } /* diff --git a/drivers/isdn/gigaset/usb-gigaset.c b/drivers/isdn/gigaset/usb-gigaset.c index f65cf7db..4a66338 100644 --- a/drivers/isdn/gigaset/usb-gigaset.c +++ b/drivers/isdn/gigaset/usb-gigaset.c @@ -494,29 +494,13 @@ static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb) } /* Send command to device. */ -static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf, - int len, struct tasklet_struct *wake_tasklet) +static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb) { - struct cmdbuf_t *cb; unsigned long flags; gigaset_dbg_buffer(cs->mstate != MS_LOCKED ? DEBUG_TRANSCMD : DEBUG_LOCKCMD, - "CMD Transmit", len, buf); - - if (len <= 0) - return 0; - cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC); - if (!cb) { - dev_err(cs->dev, "%s: out of memory\n", __func__); - return -ENOMEM; - } - - memcpy(cb->buf, buf, len); - cb->len = len; - cb->offset = 0; - cb->next = NULL; - cb->wake_tasklet = wake_tasklet; + "CMD Transmit", cb->len, cb->buf); spin_lock_irqsave(&cs->cmdlock, flags); cb->prev = cs->lastcmdbuf; @@ -524,9 +508,9 @@ static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf, cs->lastcmdbuf->next = cb; else { cs->cmdbuf = cb; - cs->curlen = len; + cs->curlen = cb->len; } - cs->cmdbytes += len; + cs->cmdbytes += cb->len; cs->lastcmdbuf = cb; spin_unlock_irqrestore(&cs->cmdlock, flags); @@ -534,7 +518,7 @@ static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf, if (cs->connected) tasklet_schedule(&cs->write_tasklet); spin_unlock_irqrestore(&cs->lock, flags); - return len; + return cb->len; } static int gigaset_write_room(struct cardstate *cs)