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scsi: pm80xx: Do not call scsi_remove_host() in pm8001_alloc()

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commit 6539262057 upstream.

Calling scsi_remove_host() before scsi_add_host() results in a crash:

 BUG: kernel NULL pointer dereference, address: 0000000000000108
 RIP: 0010:device_del+0x63/0x440
 Call Trace:
  device_unregister+0x17/0x60
  scsi_remove_host+0xee/0x2a0
  pm8001_pci_probe+0x6ef/0x1b90 [pm80xx]
  local_pci_probe+0x3f/0x90

We cannot call scsi_remove_host() in pm8001_alloc() because scsi_add_host()
has not been called yet at that point in time.

Function call tree:

  pm8001_pci_probe()
  |
  `- pm8001_pci_alloc()
  |  |
  |  `- pm8001_alloc()
  |     |
  |     `- scsi_remove_host()
  |
  `- scsi_add_host()

Link: https://lore.kernel.org/r/20211201041627.1592487-1-ipylypiv@google.com
Fixes: 05c6c029a4 ("scsi: pm80xx: Increase number of supported queues")
Reviewed-by: Vishakha Channapattan <vishakhavc@google.com>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Igor Pylypiv
2021-11-30 20:16:27 -08:00
committed by Greg Kroah-Hartman
parent 5dfe611474
commit 1e434d2687
1 changed files with 2 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/scsi/pm8001/pm8001_init.c
View File

@@ -280,12 +280,12 @@ static int pm8001_alloc(struct pm8001_hba_info *pm8001_ha,
if (rc) {
pm8001_dbg(pm8001_ha, FAIL,
"pm8001_setup_irq failed [ret: %d]\n", rc);
goto err_out_shost;
goto err_out;
}
/* Request Interrupt */
rc = pm8001_request_irq(pm8001_ha);
if (rc)
goto err_out_shost;
goto err_out;
count = pm8001_ha->max_q_num;
/* Queues are chosen based on the number of cores/msix availability */
@@ -419,8 +419,6 @@ static int pm8001_alloc(struct pm8001_hba_info *pm8001_ha,
pm8001_tag_init(pm8001_ha);
return 0;
err_out_shost:
scsi_remove_host(pm8001_ha->shost);
err_out_nodev:
for (i = 0; i < pm8001_ha->max_memcnt; i++) {
if (pm8001_ha->memoryMap.region[i].virt_ptr != NULL) {