4.19-stable review patch. If anyone has any objections, please let me know.
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From: Ben Whitten ben.whitten@gmail.com
commit 6275c7bc8dd07644ea8142a1773d826800f0f3f7 upstream.
Fix a race condition if the clock provider comes up after mmc is probed, this causes mmc to fail without retrying. When given the DEFER error from the clk source, pass it on up the chain.
Fixes: f90a0612f0e1 ("mmc: dw_mmc: lookup for optional biu and ciu clocks") Signed-off-by: Ben Whitten ben.whitten@gmail.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240811212212.123255-1-ben.whitten@gmail.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/mmc/host/dw_mmc.c | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -3205,6 +3205,10 @@ int dw_mci_probe(struct dw_mci *host) host->biu_clk = devm_clk_get(host->dev, "biu"); if (IS_ERR(host->biu_clk)) { dev_dbg(host->dev, "biu clock not available\n"); + ret = PTR_ERR(host->biu_clk); + if (ret == -EPROBE_DEFER) + return ret; + } else { ret = clk_prepare_enable(host->biu_clk); if (ret) { @@ -3216,6 +3220,10 @@ int dw_mci_probe(struct dw_mci *host) host->ciu_clk = devm_clk_get(host->dev, "ciu"); if (IS_ERR(host->ciu_clk)) { dev_dbg(host->dev, "ciu clock not available\n"); + ret = PTR_ERR(host->ciu_clk); + if (ret == -EPROBE_DEFER) + goto err_clk_biu; + host->bus_hz = host->pdata->bus_hz; } else { ret = clk_prepare_enable(host->ciu_clk);