dmaengine: sdxi: Remove sdxi_dev->cxt_lock

Explicit locking may become necessary in the future, but at this point
I see no need.

Signed-off-by: Nathan Lynch <nathan.lynch@amd.com>

Author: nathanlynch

drivers/dma/sdxi/device.c

@@ -12,7 +12,6 @@
 #include <linux/dmapool.h>
 #include <linux/log2.h>
 #include <linux/module.h>
-#include <linux/mutex.h>
 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/xarray.h>
@@ -340,10 +339,6 @@ int sdxi_register(struct device *dev, const struct sdxi_bus_ops *ops)
 	if (!sdxi)
 		return -ENOMEM;
 
-	err = devm_mutex_init(dev, &sdxi->cxt_lock);
-	if (err)
-		return err;
-
 	sdxi->dev = dev;
 	sdxi->bus_ops = ops;
 	ida_init(&sdxi->vectors);

drivers/dma/sdxi/pci.c

@@ -17,7 +17,6 @@
 #include <linux/iomap.h>
 #include <linux/math64.h>
 #include <linux/module.h>
-#include <linux/mutex.h>
 #include <linux/pci-ats.h>
 #include <linux/pci.h>
 

drivers/dma/sdxi/sdxi.h

@@ -16,7 +16,6 @@
 #include <linux/idr.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 #include <linux/module.h>
-#include <linux/mutex.h>
 #include <linux/types.h>
 #include <linux/xarray.h>
 
@@ -116,7 +115,6 @@ struct sdxi_dev {
 	u32 op_grp_cap;			/* supported operatation group cap */
 
 	/* context management */
-	struct mutex cxt_lock;		/* context protection */
 	struct sdxi_cxt_l2_table *L2_table;
 	dma_addr_t L2_dma;
 	struct sdxi_cxt_l1_table *L1_table;