i3c: master: dw: check return of dw_i3c_master_get_free_pos()

[ Upstream commit 13462ba1815db5a96891293a9cfaa2451f7bd623 ]

Clang static analysis reports this problem
dw-i3c-master.c:799:9: warning: The result of the left shift is
  undefined because the left operand is negative
                      COMMAND_PORT_DEV_INDEX(pos) |
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~

pos can be negative because dw_i3c_master_get_free_pos() can return an
error.  So check for an error.

Fixes: 1dd728f5d4d4 ("i3c: master: Add driver for Synopsys DesignWare IP")
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220108150948.3988790-1-trix@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
index 03a368da51b95bfa8e7c02f465d93c99f54be42e..51a8608203de78eac9af7899f33f994d69a8189e 100644 (file)
--- a/drivers/i3c/master/dw-i3c-master.c
+++ b/drivers/i3c/master/dw-i3c-master.c
@@ -793,6 +793,10 @@ static int dw_i3c_master_daa(struct i3c_master_controller *m)
                return -ENOMEM;
 
        pos = dw_i3c_master_get_free_pos(master);
+       if (pos < 0) {
+               dw_i3c_master_free_xfer(xfer);
+               return pos;
+       }
        cmd = &xfer->cmds[0];
        cmd->cmd_hi = 0x1;
        cmd->cmd_lo = COMMAND_PORT_DEV_COUNT(master->maxdevs - pos) |