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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2018-06-21 11:00:05 +0300
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2018-07-27 02:58:12 +0300
commit9840fcd8cc43bfba486a53b4461044f1a1189cdc (patch)
treea2ba69532326e0b578283f277c741b4c7de7a21f /drivers/fsi/fsi-master.h
parentd1dcd678257603e71cf3f3d84c70e2b6f0f14bb8 (diff)
downloadlinux-9840fcd8cc43bfba486a53b4461044f1a1189cdc.tar.xz
fsi: Prevent multiple concurrent rescans
The bus scanning process isn't terribly good at parallel attempts at rescanning the same bus. Let's have a per-master mutex protecting the scanning process. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'drivers/fsi/fsi-master.h')
-rw-r--r--drivers/fsi/fsi-master.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h
index f653f75da7be..040a7d4cf717 100644
--- a/drivers/fsi/fsi-master.h
+++ b/drivers/fsi/fsi-master.h
@@ -18,6 +18,7 @@
#define DRIVERS_FSI_MASTER_H
#include <linux/device.h>
+#include <linux/mutex.h>
/* Various protocol delays */
#define FSI_ECHO_DELAY_CLOCKS 16 /* Number clocks for echo delay */
@@ -59,6 +60,7 @@ struct fsi_master {
int idx;
int n_links;
int flags;
+ struct mutex scan_lock;
int (*read)(struct fsi_master *, int link, uint8_t id,
uint32_t addr, void *val, size_t size);
int (*write)(struct fsi_master *, int link, uint8_t id,