diff options
| author | Ming Lei <ming.lei@redhat.com> | 2020-10-10 05:25:39 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-10-26 21:05:34 +0100 |
| commit | 831e3405c2a344018a18fcc2665acc5a38c3a707 (patch) | |
| tree | 55edf7cfc12446727e86994b307d4c4b413f828d /mm/page_io.c | |
| parent | Linux 5.10-rc1 (diff) | |
| download | linux-831e3405c2a344018a18fcc2665acc5a38c3a707.tar.xz linux-831e3405c2a344018a18fcc2665acc5a38c3a707.zip | |
scsi: core: Don't start concurrent async scan on same host
The current scanning mechanism is supposed to fall back to a synchronous
host scan if an asynchronous scan is in progress. However, this rule isn't
strictly respected, scsi_prep_async_scan() doesn't hold scan_mutex when
checking shost->async_scan. When scsi_scan_host() is called concurrently,
two async scans on same host can be started and a hang in do_scan_async()
is observed.
Fixes this issue by checking & setting shost->async_scan atomically with
shost->scan_mutex.
Link: https://lore.kernel.org/r/20201010032539.426615-1-ming.lei@redhat.com
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ewan D. Milne <emilne@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'mm/page_io.c')
0 files changed, 0 insertions, 0 deletions