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ata fixes for 6.4-rc5

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* Fix ata_find_dev() use of the device number to find a struct
    ata_device for a port. This addresses issues with some passthrough
    commands with libsas managed devices.
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Merge tag 'ata-6.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata

Pull ata fix from Damien Le Moal:

 - Fix ata_find_dev() use of the device number to find a struct
   ata_device for a port. This addresses issues with some passthrough
   commands with libsas managed devices.

* tag 'ata-6.4-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata:
  ata: libata-scsi: Use correct device no in ata_find_dev()
This commit is contained in:
Linus Torvalds 2023-06-01 08:41:33 -04:00
commit ba059590ec
1 changed files with 26 additions and 8 deletions
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34
drivers/ata/libata-scsi.c
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@ -2694,18 +2694,36 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
return 0;
}
static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
static struct ata_device *ata_find_dev(struct ata_port *ap, unsigned int devno)
{
if (!sata_pmp_attached(ap)) {
if (likely(devno >= 0 &&
devno < ata_link_max_devices(&ap->link)))
/*
* For the non-PMP case, ata_link_max_devices() returns 1 (SATA case),
* or 2 (IDE master + slave case). However, the former case includes
* libsas hosted devices which are numbered per scsi host, leading
* to devno potentially being larger than 0 but with each struct
* ata_device having its own struct ata_port and struct ata_link.
* To accommodate these, ignore devno and always use device number 0.
*/
if (likely(!sata_pmp_attached(ap))) {
int link_max_devices = ata_link_max_devices(&ap->link);
if (link_max_devices == 1)
return &ap->link.device[0];
if (devno < link_max_devices)
return &ap->link.device[devno];
} else {
if (likely(devno >= 0 &&
devno < ap->nr_pmp_links))
return &ap->pmp_link[devno].device[0];
return NULL;
}
/*
* For PMP-attached devices, the device number corresponds to C
* (channel) of SCSI [H:C:I:L], indicating the port pmp link
* for the device.
*/
if (devno < ap->nr_pmp_links)
return &ap->pmp_link[devno].device[0];
return NULL;
}