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

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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: 1dd728f5d4 ("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
This commit is contained in:
Tom Rix 2022-01-08 07:09:48 -08:00 committed by Alexandre Belloni
parent 7a2bccd1a2
commit 13462ba181
1 changed files with 4 additions and 0 deletions
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4
drivers/i3c/master/dw-i3c-master.c
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@ -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) |