[PATCH] staging: fbtft: fix unaligned vmem writes when txbuf is byte-offset

[suryasaimadhu]

fbtft_write_vmem16_bus8() and fb_ra8875's write_vmem16_bus8() offset
txbuf16 by one byte for a command/start prefix, then store 16-bit pixel
data via txbuf16[i]. On strict-alignment architectures this can fault
the same way as the write_reg path fixed in the previous patch.

Use put_unaligned() for these stores.

Signed-off-by: suryasaimadhu <suryasaimadhu369@xxxxxxxxx>
---
 drivers/staging/fbtft/fb_ra8875.c | 3 ++-
 drivers/staging/fbtft/fbtft-bus.c | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/fbtft/fb_ra8875.c b/drivers/staging/fbtft/fb_ra8875.c
index 0ab1de664..5b95b0095 100644
--- a/drivers/staging/fbtft/fb_ra8875.c
+++ b/drivers/staging/fbtft/fb_ra8875.c
@@ -10,6 +10,7 @@
 #include <linux/delay.h>
 
 #include <linux/gpio/consumer.h>
+#include <linux/unaligned.h>
 #include "fbtft.h"
 
 #define DRVNAME "fb_ra8875"
@@ -262,7 +263,7 @@ static int write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len)
 			to_copy, remain - to_copy);
 
 		for (i = 0; i < to_copy; i++)
-			txbuf16[i] = cpu_to_be16(vmem16[i]);
+			put_unaligned(cpu_to_be16(vmem16[i]), &txbuf16[i]);
 
 		vmem16 = vmem16 + to_copy;
 		ret = par->fbtftops.write(par, par->txbuf.buf,
diff --git a/drivers/staging/fbtft/fbtft-bus.c b/drivers/staging/fbtft/fbtft-bus.c
index cfcf4d7e7..fc3faab7d 100644
--- a/drivers/staging/fbtft/fbtft-bus.c
+++ b/drivers/staging/fbtft/fbtft-bus.c
@@ -158,7 +158,7 @@ int fbtft_write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len)
 			to_copy, remain - to_copy);
 
 		for (i = 0; i < to_copy; i++)
-			txbuf16[i] = cpu_to_be16(vmem16[i]);
+			put_unaligned(cpu_to_be16(vmem16[i]), &txbuf16[i]);
 
 		vmem16 = vmem16 + to_copy;
 		ret = par->fbtftops.write(par, par->txbuf.buf,
-- 
2.47.3