lkml.org 
[lkml]   [2007]   [Mar]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH 24 of 33] IB/ipath - fix driver crash (in interrupt or during unload) after chip reset
Date
From
# HG changeset patch
# User Michael Albaugh <Michael.Albaugh@QLogic.com>
# Date 1173994465 25200
# Node ID 3e81a6b18b42bbe6dffab382fb26d754dfdf83a1
# Parent 01cde17958018b5262570cd9ea399378f95051e7
IB/ipath - fix driver crash (in interrupt or during unload) after chip reset

Re-init of the kernel structures after a chip reset was leaving the
portdata structure for port zero in an inconsistent state, and a pointer
to it either stale (in re-init code) or NULL (in devdata) Fixing the
order of operations on this struct, and the condition for interrupt
access, prevents the crashes.

Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>

diff -r 01cde1795801 -r 3e81a6b18b42 drivers/infiniband/hw/ipath/ipath_init_chip.c
--- a/drivers/infiniband/hw/ipath/ipath_init_chip.c Thu Mar 15 14:34:25 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_init_chip.c Thu Mar 15 14:34:25 2007 -0700
@@ -216,6 +216,20 @@ static int bringup_link(struct ipath_dev
return ret;
}

+static struct ipath_portdata *create_portdata0(struct ipath_devdata *dd)
+{
+ struct ipath_portdata *pd = NULL;
+
+ pd = kzalloc(sizeof(*pd), GFP_KERNEL);
+ if (pd) {
+ pd->port_dd = dd;
+ pd->port_cnt = 1;
+ /* The port 0 pkey table is used by the layer interface. */
+ pd->port_pkeys[0] = IPATH_DEFAULT_P_KEY;
+ }
+ return pd;
+}
+
static int init_chip_first(struct ipath_devdata *dd,
struct ipath_portdata **pdp)
{
@@ -271,20 +285,16 @@ static int init_chip_first(struct ipath_
goto done;
}

- dd->ipath_pd[0] = kzalloc(sizeof(*pd), GFP_KERNEL);
-
- if (!dd->ipath_pd[0]) {
+ pd = create_portdata0(dd);
+
+ if (!pd) {
ipath_dev_err(dd, "Unable to allocate portdata for port "
"0, failing\n");
ret = -ENOMEM;
goto done;
}
- pd = dd->ipath_pd[0];
- pd->port_dd = dd;
- pd->port_port = 0;
- pd->port_cnt = 1;
- /* The port 0 pkey table is used by the layer interface. */
- pd->port_pkeys[0] = IPATH_DEFAULT_P_KEY;
+ dd->ipath_pd[0] = pd;
+
dd->ipath_rcvtidcnt =
ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidcnt);
dd->ipath_rcvtidbase =
@@ -838,11 +848,24 @@ int ipath_init_chip(struct ipath_devdata
* Set up the port 0 (kernel) rcvhdr q and egr TIDs. If doing
* re-init, the simplest way to handle this is to free
* existing, and re-allocate.
+ * Need to re-create rest of port 0 portdata as well.
*/
if (reinit) {
- struct ipath_portdata *pd = dd->ipath_pd[0];
- dd->ipath_pd[0] = NULL;
- ipath_free_pddata(dd, pd);
+ /* Alloc and init new ipath_portdata for port0,
+ * Then free old pd. Could lead to fragmentation, but also
+ * makes later support for hot-swap easier.
+ */
+ struct ipath_portdata *npd;
+ npd = create_portdata0(dd);
+ if (npd) {
+ ipath_free_pddata(dd, pd);
+ dd->ipath_pd[0] = pd = npd;
+ } else {
+ ipath_dev_err(dd, "Unable to allocate portdata for"
+ " port 0, failing\n");
+ ret = -ENOMEM;
+ goto done;
+ }
}
dd->ipath_f_tidtemplate(dd);
ret = ipath_create_rcvhdrq(dd, pd);
diff -r 01cde1795801 -r 3e81a6b18b42 drivers/infiniband/hw/ipath/ipath_stats.c
--- a/drivers/infiniband/hw/ipath/ipath_stats.c Thu Mar 15 14:34:25 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_stats.c Thu Mar 15 14:34:25 2007 -0700
@@ -207,7 +207,7 @@ void ipath_get_faststats(unsigned long o
* don't access the chip while running diags, or memory diags can
* fail
*/
- if (!dd->ipath_kregbase || !(dd->ipath_flags & IPATH_PRESENT) ||
+ if (!dd->ipath_kregbase || !(dd->ipath_flags & IPATH_INITTED) ||
ipath_diag_inuse)
/* but re-arm the timer, for diags case; won't hurt other */
goto done;
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2007-03-15 23:27    [W:0.151 / U:9.352 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site