[bug report] i3c: master: svc: Add Silvaco I3C master driver

[Dan Carpenter]

Hello Miquel Raynal,

The patch dd3c52846d59: "i3c: master: svc: Add Silvaco I3C master
driver" from Jan 21, 2021, leads to the following static checker
warning:

	drivers/i3c/master/svc-i3c-master.c:690 svc_i3c_master_do_daa_locked()
	warn: sleeping in atomic context

drivers/i3c/master/svc-i3c-master.c
    670 static int svc_i3c_master_do_daa_locked(struct svc_i3c_master *master,
    671 					u8 *addrs, unsigned int *count)
    672 {
    673 	u64 prov_id[SVC_I3C_MAX_DEVS] = {}, nacking_prov_id = 0;
    674 	unsigned int dev_nb = 0, last_addr = 0;
    675 	u32 reg;
    676 	int ret, i;
    677 
    678 	while (true) {
    679 		/* Enter/proceed with DAA */
    680 		writel(SVC_I3C_MCTRL_REQUEST_PROC_DAA |
    681 		       SVC_I3C_MCTRL_TYPE_I3C |
    682 		       SVC_I3C_MCTRL_IBIRESP_NACK |
    683 		       SVC_I3C_MCTRL_DIR(SVC_I3C_MCTRL_DIR_WRITE),
    684 		       master->regs + SVC_I3C_MCTRL);
    685 
    686 		/*
    687 		 * Either one slave will send its ID, or the assignment process
    688 		 * is done.
    689 		 */
--> 690 		ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
    691 					 SVC_I3C_MSTATUS_RXPEND(reg) |
    692 					 SVC_I3C_MSTATUS_MCTRLDONE(reg),
    693 					 1, 1000);
                                                 ^
This is called with a lock held and the code is doing a 1 us sleep.

    694 		if (ret)
    695 			return ret;
    696 

regards,
dan carpenter