powerpc/powernv: Fix NVRAM sleep in invalid context when crashing

commit c1d2a31397ec51f0370f6bd17b19b39152c263cb upstream.

Similarly to opal_event_shutdown, opal_nvram_write can be called in
the crash path with irqs disabled. Special case the delay to avoid
sleeping in invalid context.

Fixes: 3b8070335f75 ("powerpc/powernv: Fix OPAL NVRAM driver OPAL_BUSY loops")
Cc: stable@vger.kernel.org # v3.2
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/platforms/powernv/opal-nvram.c b/arch/powerpc/platforms/powernv/opal-nvram.c
index 1bceb95..5584247 100644 (file)
--- a/arch/powerpc/platforms/powernv/opal-nvram.c
+++ b/arch/powerpc/platforms/powernv/opal-nvram.c
@@ -44,6 +44,10 @@ static ssize_t opal_nvram_read(char *buf, size_t count, loff_t *index)
        return count;
 }
 
+/*
+ * This can be called in the panic path with interrupts off, so use
+ * mdelay in that case.
+ */
 static ssize_t opal_nvram_write(char *buf, size_t count, loff_t *index)
 {
        s64 rc = OPAL_BUSY;
@@ -58,10 +62,16 @@ static ssize_t opal_nvram_write(char *buf, size_t count, loff_t *index)
        while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
                rc = opal_write_nvram(__pa(buf), count, off);
                if (rc == OPAL_BUSY_EVENT) {
-                       msleep(OPAL_BUSY_DELAY_MS);
+                       if (in_interrupt() || irqs_disabled())
+                               mdelay(OPAL_BUSY_DELAY_MS);
+                       else
+                               msleep(OPAL_BUSY_DELAY_MS);
                        opal_poll_events(NULL);
                } else if (rc == OPAL_BUSY) {
-                       msleep(OPAL_BUSY_DELAY_MS);
+                       if (in_interrupt() || irqs_disabled())
+                               mdelay(OPAL_BUSY_DELAY_MS);
+                       else
+                               msleep(OPAL_BUSY_DELAY_MS);
                }
        }