block: ataflop: fix breakage introduced at blk-mq refactoring

[ Upstream commit 86d46fdaa12ae5befc16b8d73fc85a3ca0399ea6 ]

Refactoring of the Atari floppy driver when converting to blk-mq
has broken the state machine in not-so-subtle ways:

finish_fdc() must be called when operations on the floppy device
have completed. This is crucial in order to relase the ST-DMA
lock, which protects against concurrent access to the ST-DMA
controller by other drivers (some DMA related, most just related
to device register access - broken beyond compare, I know).

When rewriting the driver's old do_request() function, the fact
that finish_fdc() was called only when all queued requests had
completed appears to have been overlooked. Instead, the new
request function calls finish_fdc() immediately after the last
request has been queued. finish_fdc() executes a dummy seek after
most requests, and this overwrites the state machine's interrupt
hander that was set up to wait for completion of the read/write
request just prior. To make matters worse, finish_fdc() is called
before device interrupts are re-enabled, making certain that the
read/write interupt is missed.

Shifting the finish_fdc() call into the read/write request
completion handler ensures the driver waits for the request to
actually complete. With a queue depth of 2, we won't see long
request sequences, so calling finish_fdc() unconditionally just
adds a little overhead for the dummy seeks, and keeps the code
simple.

While we're at it, kill ataflop_commit_rqs() which does nothing
but run finish_fdc() unconditionally, again likely wiping out an
in-flight request.

Signed-off-by: Michael Schmitz <schmitzmic@gmail.com>
Fixes: 6ec3938cff95 ("ataflop: convert to blk-mq")
CC: linux-block@vger.kernel.org
CC: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Link: https://lore.kernel.org/r/20211019061321.26425-1-schmitzmic@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index a093644..bbb6433 100644 (file)
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -653,9 +653,6 @@ static inline void copy_buffer(void *from, void *to)
                *p2++ = *p1++;
 }
 
-  
-  
-
 /* General Interrupt Handling */
 
 static void (*FloppyIRQHandler)( int status ) = NULL;
@@ -1228,6 +1225,7 @@ static void fd_rwsec_done1(int status)
        }
        else {
                /* all sectors finished */
+               finish_fdc();
                fd_end_request_cur(BLK_STS_OK);
        }
        return;
@@ -1475,15 +1473,6 @@ static void setup_req_params( int drive )
                        ReqTrack, ReqSector, (unsigned long)ReqData ));
 }
 
-static void ataflop_commit_rqs(struct blk_mq_hw_ctx *hctx)
-{
-       spin_lock_irq(&ataflop_lock);
-       atari_disable_irq(IRQ_MFP_FDC);
-       finish_fdc();
-       atari_enable_irq(IRQ_MFP_FDC);
-       spin_unlock_irq(&ataflop_lock);
-}
-
 static blk_status_t ataflop_queue_rq(struct blk_mq_hw_ctx *hctx,
                                     const struct blk_mq_queue_data *bd)
 {
@@ -1491,6 +1480,8 @@ static blk_status_t ataflop_queue_rq(struct blk_mq_hw_ctx *hctx,
        int drive = floppy - unit;
        int type = floppy->type;
 
+       DPRINT(("Queue request: drive %d type %d last %d\n", drive, type, bd->last));
+
        spin_lock_irq(&ataflop_lock);
        if (fd_request) {
                spin_unlock_irq(&ataflop_lock);
@@ -1550,8 +1541,6 @@ static blk_status_t ataflop_queue_rq(struct blk_mq_hw_ctx *hctx,
        setup_req_params( drive );
        do_fd_action( drive );
 
-       if (bd->last)
-               finish_fdc();
        atari_enable_irq( IRQ_MFP_FDC );
 
 out:
@@ -1962,7 +1951,6 @@ static const struct block_device_operations floppy_fops = {
 
 static const struct blk_mq_ops ataflop_mq_ops = {
        .queue_rq = ataflop_queue_rq,
-       .commit_rqs = ataflop_commit_rqs,
 };
 
 static int ataflop_alloc_disk(unsigned int drive, unsigned int type)