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isdn/gigaset: fix bas_gigaset AT read error handling 

Rework the handling of USB errors in AT response reads
to fix a possible infinite retry loop and a memory leak,
and silence a few overly verbose kernel messages.

Signed-off-by: Tilman Schmidt <tilman@imap.cc>
CC: stable <stable@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tilman Schmidt 2010-09-30 13:34:40 +00:00 committed by David S. Miller
parent b33ffa5cbf
commit c8701a08d6
1 changed files with 33 additions and 50 deletions
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83
drivers/isdn/gigaset/bas-gigaset.c
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@ -438,23 +438,27 @@ static void cmd_in_timeout(unsigned long data)
return;
}
if (ucs->retry_cmd_in++ < BAS_RETRY) {
dev_notice(cs->dev, "control read: timeout, retry %d\n",
ucs->retry_cmd_in);
rc = atread_submit(cs, BAS_TIMEOUT);
if (rc >= 0 || rc == -ENODEV)
/* resubmitted or disconnected */
/* - bypass regular exit block */
return;
} else {
if (ucs->retry_cmd_in++ >= BAS_RETRY) {
dev_err(cs->dev,
"control read: timeout, giving up after %d tries\n",
ucs->retry_cmd_in);
kfree(ucs->rcvbuf);
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
error_reset(cs);
return;
}
gig_dbg(DEBUG_USBREQ, "%s: timeout, retry %d",
__func__, ucs->retry_cmd_in);
rc = atread_submit(cs, BAS_TIMEOUT);
if (rc < 0) {
kfree(ucs->rcvbuf);
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
if (rc != -ENODEV)
error_reset(cs);
}
kfree(ucs->rcvbuf);
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
error_reset(cs);
}
/* read_ctrl_callback
@ -470,18 +474,11 @@ static void read_ctrl_callback(struct urb *urb)
struct cardstate *cs = inbuf->cs;
struct bas_cardstate *ucs = cs->hw.bas;
int status = urb->status;
int have_data = 0;
unsigned numbytes;
int rc;
update_basstate(ucs, 0, BS_ATRDPEND);
wake_up(&ucs->waitqueue);
if (!ucs->rcvbuf_size) {
dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
return;
}
del_timer(&ucs->timer_cmd_in);
switch (status) {
@ -495,19 +492,10 @@ static void read_ctrl_callback(struct urb *urb)
numbytes = ucs->rcvbuf_size;
}
/* copy received bytes to inbuf */
have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
if (unlikely(numbytes < ucs->rcvbuf_size)) {
/* incomplete - resubmit for remaining bytes */
ucs->rcvbuf_size -= numbytes;
ucs->retry_cmd_in = 0;
rc = atread_submit(cs, BAS_TIMEOUT);
if (rc >= 0 || rc == -ENODEV)
/* resubmitted or disconnected */
/* - bypass regular exit block */
return;
error_reset(cs);
/* copy received bytes to inbuf, notify event layer */
if (gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes)) {
gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
gigaset_schedule_event(cs);
}
break;
@ -516,37 +504,32 @@ static void read_ctrl_callback(struct urb *urb)
case -EINPROGRESS: /* pending */
case -ENODEV: /* device removed */
case -ESHUTDOWN: /* device shut down */
/* no action necessary */
/* no further action necessary */
gig_dbg(DEBUG_USBREQ, "%s: %s",
__func__, get_usb_statmsg(status));
break;
default: /* severe trouble */
dev_warn(cs->dev, "control read: %s\n",
get_usb_statmsg(status));
default: /* other errors: retry */
if (ucs->retry_cmd_in++ < BAS_RETRY) {
dev_notice(cs->dev, "control read: retry %d\n",
ucs->retry_cmd_in);
gig_dbg(DEBUG_USBREQ, "%s: %s, retry %d", __func__,
get_usb_statmsg(status), ucs->retry_cmd_in);
rc = atread_submit(cs, BAS_TIMEOUT);
if (rc >= 0 || rc == -ENODEV)
/* resubmitted or disconnected */
/* - bypass regular exit block */
if (rc >= 0)
/* successfully resubmitted, skip freeing */
return;
} else {
dev_err(cs->dev,
"control read: giving up after %d tries\n",
ucs->retry_cmd_in);
if (rc == -ENODEV)
/* disconnect, no further action necessary */
break;
}
dev_err(cs->dev, "control read: %s, giving up after %d tries\n",
get_usb_statmsg(status), ucs->retry_cmd_in);
error_reset(cs);
}
/* read finished, free buffer */
kfree(ucs->rcvbuf);
ucs->rcvbuf = NULL;
ucs->rcvbuf_size = 0;
if (have_data) {
gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
gigaset_schedule_event(cs);
}
}
/* atread_submit