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authorPete Zaitcev <zaitcev@redhat.com>2008-04-19 23:42:49 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2008-05-02 19:25:52 +0200
commit0da13c8c3dfb1ab6c56f2a70fadfddd57e0d7c42 (patch)
treec2ec2a7d4e1ef7fd1441131ed0fc9f2cec5553f0 /drivers/block/ub.c
parentub: Tune retries (diff)
downloadlinux-0da13c8c3dfb1ab6c56f2a70fadfddd57e0d7c42.tar.xz
linux-0da13c8c3dfb1ab6c56f2a70fadfddd57e0d7c42.zip
ub: Ignore bad residue
I hoped to continue to ignore this problem or use libusual, but these days it's simpler to work around than to deal with it. Let's attempt to use bad residue devices and hope that upper level integrity checks catch any problems (e.g. please use sha1sum on your backups). Signed-off-by: Pete Zaitcev <zaitcev@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/block/ub.c')
-rw-r--r--drivers/block/ub.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 5c6a6e89d2fb..e2c3ebd8db22 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -319,6 +319,7 @@ struct ub_dev {
int openc; /* protected by ub_lock! */
/* kref is too implicit for our taste */
int reset; /* Reset is running */
+ int bad_resid;
unsigned int tagcnt;
char name[12];
struct usb_device *dev;
@@ -1265,14 +1266,19 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
return;
}
- len = le32_to_cpu(bcs->Residue);
- if (len != cmd->len - cmd->act_len) {
- /*
- * It is all right to transfer less, the caller has
- * to check. But it's not all right if the device
- * counts disagree with our counts.
- */
- goto Bad_End;
+ if (!sc->bad_resid) {
+ len = le32_to_cpu(bcs->Residue);
+ if (len != cmd->len - cmd->act_len) {
+ /*
+ * Only start ignoring if this cmd ended well.
+ */
+ if (cmd->len == cmd->act_len) {
+ printk(KERN_NOTICE "%s: "
+ "bad residual %d of %d, ignoring\n",
+ sc->name, len, cmd->len);
+ sc->bad_resid = 1;
+ }
+ }
}
switch (bcs->Status) {