From 13462ba1815db5a96891293a9cfaa2451f7bd623 Mon Sep 17 00:00:00 2001 From: Tom Rix Date: Sat, 8 Jan 2022 07:09:48 -0800 Subject: [PATCH] i3c: master: dw: check return of dw_i3c_master_get_free_pos() 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 Signed-off-by: Alexandre Belloni Link: https://lore.kernel.org/r/20220108150948.3988790-1-trix@redhat.com --- drivers/i3c/master/dw-i3c-master.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c index 03a368d..51a8608 100644 --- 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) | -- 2.7.4