Add support write cache quirk on usb hdd. scsi driver will be set to wce by detecting write cache quirk in quirk list when plugging usb hdd. Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx> Signed-off-by: Pankaj Kumar <pankaj.km@xxxxxxxxxxx> Signed-off-by: Amit Sahrawat <a.sahrawat@xxxxxxxxxxx> --- drivers/usb/storage/scsiglue.c | 6 ++++++ drivers/usb/storage/usb.c | 5 ++++- include/linux/usb/quirks.h | 3 +++ include/linux/usb_usual.h | 4 +++- 4 files changed, 16 insertions(+), 2 deletions(-) diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c index a324a5d..f7d0ea5 100644 --- a/drivers/usb/storage/scsiglue.c +++ b/drivers/usb/storage/scsiglue.c @@ -51,6 +51,7 @@ #include <scsi/scsi_devinfo.h> #include <scsi/scsi_device.h> #include <scsi/scsi_eh.h> +#include <linux/usb/quirks.h> #include "usb.h" #include "scsiglue.h" @@ -230,6 +231,11 @@ static int slave_configure(struct scsi_device *sdev) US_FL_SCM_MULT_TARG)) && us->protocol == USB_PR_BULK) us->use_last_sector_hacks = 1; + + /* Check for the cache quirk present or not */ + if (us->pusb_dev->quirks & USB_QUIRK_WRITE_CACHE || + us->fflags & US_FL_WRITE_CACHE) + sdev->wce_quirk = 1; } else { /* Non-disk-type devices don't need to blacklist any pages diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c index e23c30a..062d7d5 100644 --- a/drivers/usb/storage/usb.c +++ b/drivers/usb/storage/usb.c @@ -473,7 +473,7 @@ static void adjust_quirks(struct us_data *us) US_FL_CAPACITY_OK | US_FL_IGNORE_RESIDUE | US_FL_SINGLE_LUN | US_FL_NO_WP_DETECT | US_FL_NO_READ_DISC_INFO | US_FL_NO_READ_CAPACITY_16 | - US_FL_INITIAL_READ10); + US_FL_INITIAL_READ10 | US_FL_WRITE_CACHE); p = quirks; while (*p) { @@ -538,6 +538,9 @@ static void adjust_quirks(struct us_data *us) case 'w': f |= US_FL_NO_WP_DETECT; break; + case 'p': + f |= US_FL_WRITE_CACHE; + break; /* Ignore unrecognized flag characters */ } } diff --git a/include/linux/usb/quirks.h b/include/linux/usb/quirks.h index 3e93de7..9a3c8ab 100644 --- a/include/linux/usb/quirks.h +++ b/include/linux/usb/quirks.h @@ -30,4 +30,7 @@ descriptor */ #define USB_QUIRK_DELAY_INIT 0x00000040 +/* Device can't handle cache status request */ +#define USB_QUIRK_WRITE_CACHE 0x00000080 + #endif /* __LINUX_USB_QUIRKS_H */ diff --git a/include/linux/usb_usual.h b/include/linux/usb_usual.h index 17df360..f8fdcbf 100644 --- a/include/linux/usb_usual.h +++ b/include/linux/usb_usual.h @@ -64,7 +64,9 @@ US_FLAG(NO_READ_CAPACITY_16, 0x00080000) \ /* cannot handle READ_CAPACITY_16 */ \ US_FLAG(INITIAL_READ10, 0x00100000) \ - /* Initial READ(10) (and others) must be retried */ + /* Initial READ(10) (and others) must be retried */ \ + US_FLAG(WRITE_CACHE, 0x00200000) \ + /* Cache read status is not correct */ #define US_FLAG(name, value) US_FL_##name = value , enum { US_DO_ALL_FLAGS }; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html