bus: mhi: core: Add const qualifier to MHI config information

MHI channel, event and controller config data needs to be
treated read only information. Add const qualifier to make
sure config information passed by MHI controller is not
modified by MHI core driver.

Suggested-by: Kalle Valo <kvalo@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200929175218.8178-12-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index f69a2f3d039dcc1c836978080a56b853f4546257..d23293876be894ec27fa01a0eb85ccfe2fe480e6 100644 (file)
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -562,10 +562,10 @@ int mhi_init_chan_ctxt(struct mhi_controller *mhi_cntrl,
 }
 
 static int parse_ev_cfg(struct mhi_controller *mhi_cntrl,
-                       struct mhi_controller_config *config)
+                       const struct mhi_controller_config *config)
 {
        struct mhi_event *mhi_event;
-       struct mhi_event_config *event_cfg;
+       const struct mhi_event_config *event_cfg;
        struct device *dev = &mhi_cntrl->mhi_dev->dev;
        int i, num;
 
@@ -648,9 +648,9 @@ error_ev_cfg:
 }
 
 static int parse_ch_cfg(struct mhi_controller *mhi_cntrl,
-                       struct mhi_controller_config *config)
+                       const struct mhi_controller_config *config)
 {
-       struct mhi_channel_config *ch_cfg;
+       const struct mhi_channel_config *ch_cfg;
        struct device *dev = &mhi_cntrl->mhi_dev->dev;
        int i;
        u32 chan;
@@ -766,7 +766,7 @@ error_chan_cfg:
 }
 
 static int parse_config(struct mhi_controller *mhi_cntrl,
-                       struct mhi_controller_config *config)
+                       const struct mhi_controller_config *config)
 {
        int ret;
 
@@ -803,7 +803,7 @@ error_ev_cfg:
 }
 
 int mhi_register_controller(struct mhi_controller *mhi_cntrl,
-                           struct mhi_controller_config *config)
+                           const struct mhi_controller_config *config)
 {
        struct mhi_event *mhi_event;
        struct mhi_chan *mhi_chan;

diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index 6b987e8cc438dbcd5f6f48a03381cdf0e8a907d9..b2c0214bfbd6e5a5d86635f61325baf5f927cc54 100644 (file)
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -280,9 +280,9 @@ struct mhi_controller_config {
        u32 timeout_ms;
        u32 buf_len;
        u32 num_channels;
-       struct mhi_channel_config *ch_cfg;
+       const struct mhi_channel_config *ch_cfg;
        u32 num_events;
-       struct mhi_event_config *event_cfg;
+       const struct mhi_event_config *event_cfg;
        bool use_bounce_buf;
        bool m2_no_db;
 };
@@ -545,7 +545,7 @@ void mhi_free_controller(struct mhi_controller *mhi_cntrl);
  * @config: Configuration to use for the controller
  */
 int mhi_register_controller(struct mhi_controller *mhi_cntrl,
-                           struct mhi_controller_config *config);
+                       const struct mhi_controller_config *config);
 
 /**
  * mhi_unregister_controller - Unregister MHI controller