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| author | Roel Kluin <roel.kluin@gmail.com> | 2009-08-22 19:32:44 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-09-15 12:02:29 -0700 |
| commit | 48c8276d7ac534d62c594c9a493130ff9137675d (patch) | |
| tree | f7634439718ce421401e2160bf98b7093b1a5138 /drivers | |
| parent | 77943d31b7dfdbd1ad58d49bd16ae6e7601bcd6c (diff) | |
| download | linux-48c8276d7ac534d62c594c9a493130ff9137675d.tar.bz2 | |
Staging: rspiusb: Check usb_buffer_map_sg() retval
usb_buffer_map_sg() may return -1, check this directly.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Reviewed-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/rspiusb/rspiusb.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/staging/rspiusb/rspiusb.c b/drivers/staging/rspiusb/rspiusb.c index 04e2f92c0f62..0495fbfe59d9 100644 --- a/drivers/staging/rspiusb/rspiusb.c +++ b/drivers/staging/rspiusb/rspiusb.c @@ -611,6 +611,7 @@ static int MapUserBuffer(struct ioctl_struct *io, struct device_extension *pdx) int i = 0; int k = 0; int err = 0; + int ret; struct page **maplist_p; int numPagesRequired; @@ -687,9 +688,16 @@ static int MapUserBuffer(struct ioctl_struct *io, struct device_extension *pdx) } else { pdx->sgl[frameInfo][0].length = count; } - pdx->sgEntries[frameInfo] = - usb_buffer_map_sg(pdx->udev, epAddr, pdx->sgl[frameInfo], - pdx->maplist_numPagesMapped[frameInfo]); + ret = usb_buffer_map_sg(pdx->udev, epAddr, pdx->sgl[frameInfo], + pdx->maplist_numPagesMapped[frameInfo]); + if (ret < 0) { + vfree(maplist_p); + dbg("usb_buffer_map_sg() failed"); + return -EINVAL; + } + + pdx->sgEntries[frameInfo] = ret; + dbg("number of sgEntries = %d", pdx->sgEntries[frameInfo]); pdx->userBufMapped = 1; vfree(maplist_p); @@ -716,8 +724,6 @@ static int MapUserBuffer(struct ioctl_struct *io, struct device_extension *pdx) pdx->PixelUrb[frameInfo][i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP | URB_NO_INTERRUPT; } - if (i == 0) - return -EINVAL; /* only interrupt when last URB completes */ pdx->PixelUrb[frameInfo][--i]->transfer_flags &= ~URB_NO_INTERRUPT; pdx->pendedPixelUrbs[frameInfo] = |