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| author | John Garry <john.g.garry@oracle.com> | 2023-03-27 09:43:03 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2023-04-03 04:09:21 +0200 |
| commit | 25b80b2c7582ea15ba90b8007f1e1f1b8fc762b9 (patch) | |
| tree | dfdf88c1c09d4ea972bbd3b3b10d6783ec91cfa0 /drivers/scsi | |
| parent | scsi: scsi_debug: Change shost list lock to a mutex (diff) | |
| download | linux-25b80b2c7582ea15ba90b8007f1e1f1b8fc762b9.tar.xz linux-25b80b2c7582ea15ba90b8007f1e1f1b8fc762b9.zip | |
scsi: scsi_debug: Protect block_unblock_all_queues() with mutex
There is no reason that calls to block_unblock_all_queues() from different
context can't race with one another, so protect with the
sdebug_host_list_mutex. There's no need for a more fine-grained per shost
locking here (and we don't have a per-host lock anyway).
Also simplify some touched code in sdebug_change_qdepth().
Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20230327074310.1862889-5-john.g.garry@oracle.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/scsi_debug.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index a61e7c31dab5..cd05e2f87417 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -5497,6 +5497,8 @@ static void block_unblock_all_queues(bool block) int j; struct sdebug_queue *sqp; + lockdep_assert_held(&sdebug_host_list_mutex); + for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) atomic_set(&sqp->blocked, (int)block); } @@ -5511,10 +5513,13 @@ static void tweak_cmnd_count(void) modulo = abs(sdebug_every_nth); if (modulo < 2) return; + + mutex_lock(&sdebug_host_list_mutex); block_unblock_all_queues(true); count = atomic_read(&sdebug_cmnd_count); atomic_set(&sdebug_cmnd_count, (count / modulo) * modulo); block_unblock_all_queues(false); + mutex_unlock(&sdebug_host_list_mutex); } static void clear_queue_stats(void) @@ -6036,6 +6041,7 @@ static ssize_t delay_store(struct device_driver *ddp, const char *buf, int j, k; struct sdebug_queue *sqp; + mutex_lock(&sdebug_host_list_mutex); block_unblock_all_queues(true); for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) { @@ -6051,6 +6057,7 @@ static ssize_t delay_store(struct device_driver *ddp, const char *buf, sdebug_ndelay = 0; } block_unblock_all_queues(false); + mutex_unlock(&sdebug_host_list_mutex); } return res; } @@ -6076,6 +6083,7 @@ static ssize_t ndelay_store(struct device_driver *ddp, const char *buf, int j, k; struct sdebug_queue *sqp; + mutex_lock(&sdebug_host_list_mutex); block_unblock_all_queues(true); for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) { @@ -6092,6 +6100,7 @@ static ssize_t ndelay_store(struct device_driver *ddp, const char *buf, : DEF_JDELAY; } block_unblock_all_queues(false); + mutex_unlock(&sdebug_host_list_mutex); } return res; } @@ -6405,6 +6414,7 @@ static ssize_t max_queue_store(struct device_driver *ddp, const char *buf, if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n > 0) && (n <= SDEBUG_CANQUEUE) && (sdebug_host_max_queue == 0)) { + mutex_lock(&sdebug_host_list_mutex); block_unblock_all_queues(true); k = 0; for (j = 0, sqp = sdebug_q_arr; j < submit_queues; @@ -6421,6 +6431,7 @@ static ssize_t max_queue_store(struct device_driver *ddp, const char *buf, else atomic_set(&retired_max_queue, 0); block_unblock_all_queues(false); + mutex_unlock(&sdebug_host_list_mutex); return count; } return -EINVAL; @@ -7352,7 +7363,9 @@ static int sdebug_change_qdepth(struct scsi_device *sdev, int qdepth) if (!devip) return -ENODEV; + mutex_lock(&sdebug_host_list_mutex); block_unblock_all_queues(true); + if (qdepth > SDEBUG_CANQUEUE) { qdepth = SDEBUG_CANQUEUE; pr_warn("%s: requested qdepth [%d] exceeds canqueue [%d], trim\n", __func__, @@ -7363,9 +7376,12 @@ static int sdebug_change_qdepth(struct scsi_device *sdev, int qdepth) if (qdepth != sdev->queue_depth) scsi_change_queue_depth(sdev, qdepth); + block_unblock_all_queues(false); + mutex_unlock(&sdebug_host_list_mutex); + if (SDEBUG_OPT_Q_NOISE & sdebug_opts) sdev_printk(KERN_INFO, sdev, "%s: qdepth=%d\n", __func__, qdepth); - block_unblock_all_queues(false); + return sdev->queue_depth; } |