From d84c198f43c50c6c0bd57571acbf0f000165bd56 Mon Sep 17 00:00:00 2001 From: "Matthew R. Ochs" Date: Wed, 25 Oct 2017 16:36:29 -0500 Subject: [PATCH] scsi: cxlflash: Derive pid through accessors The cxlflash driver tracks process IDs alongside contexts to validate context ownership. Currently, the process IDs are derived by directly accessing values from the 'current' task pointer. While this method of access is fine for the current process, it is incorrect when the parent process ID is needed as the access requires serialization. To address the incorrect issue and provide a consistent means of deriving the process ID within the cxlflash driver, use the task accessors defined linux/sched.h. Signed-off-by: Matthew R. Ochs Signed-off-by: Uma Krishnan Signed-off-by: Martin K. Petersen --- drivers/scsi/cxlflash/superpipe.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/cxlflash/superpipe.c b/drivers/scsi/cxlflash/superpipe.c index ed46e8d..170fff5 100644 --- a/drivers/scsi/cxlflash/superpipe.c +++ b/drivers/scsi/cxlflash/superpipe.c @@ -165,7 +165,7 @@ struct ctx_info *get_context(struct cxlflash_cfg *cfg, u64 rctxid, struct llun_info *lli = arg; u64 ctxid = DECODE_CTXID(rctxid); int rc; - pid_t pid = current->tgid, ctxpid = 0; + pid_t pid = task_tgid_nr(current), ctxpid = 0; if (ctx_ctrl & CTX_CTRL_FILE) { lli = NULL; @@ -173,7 +173,7 @@ struct ctx_info *get_context(struct cxlflash_cfg *cfg, u64 rctxid, } if (ctx_ctrl & CTX_CTRL_CLONE) - pid = current->parent->tgid; + pid = task_ppid_nr(current); if (likely(ctxid < MAX_CONTEXT)) { while (true) { @@ -824,7 +824,7 @@ static void init_context(struct ctx_info *ctxi, struct cxlflash_cfg *cfg, ctxi->rht_perms = perms; ctxi->ctrl_map = &afu->afu_map->ctrls[ctxid].ctrl; ctxi->ctxid = ENCODE_CTXID(ctxi, ctxid); - ctxi->pid = current->tgid; /* tgid = pid */ + ctxi->pid = task_tgid_nr(current); /* tgid = pid */ ctxi->ctx = ctx; ctxi->cfg = cfg; ctxi->file = file; -- 2.7.4