diff options
Diffstat (limited to 'drivers/usb/storage/transport.c')
| -rw-r--r-- | drivers/usb/storage/transport.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c index 3a4fb023af72..589f6b4404f0 100644 --- a/drivers/usb/storage/transport.c +++ b/drivers/usb/storage/transport.c @@ -696,7 +696,7 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us) /* device supports and needs bigger sense buffer */ if (us->fflags & US_FL_SANE_SENSE) sense_size = ~0; - +Retry_Sense: US_DEBUGP("Issuing auto-REQUEST_SENSE\n"); scsi_eh_prep_cmnd(srb, &ses, NULL, 0, sense_size); @@ -720,6 +720,21 @@ void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us) srb->result = DID_ABORT << 16; goto Handle_Errors; } + + /* Some devices claim to support larger sense but fail when + * trying to request it. When a transport failure happens + * using US_FS_SANE_SENSE, we always retry with a standard + * (small) sense request. This fixes some USB GSM modems + */ + if (temp_result == USB_STOR_TRANSPORT_FAILED && + (us->fflags & US_FL_SANE_SENSE) && + sense_size != US_SENSE_SIZE) { + US_DEBUGP("-- auto-sense failure, retry small sense\n"); + sense_size = US_SENSE_SIZE; + goto Retry_Sense; + } + + /* Other failures */ if (temp_result != USB_STOR_TRANSPORT_GOOD) { US_DEBUGP("-- auto-sense failure\n"); |